Malicious PDF — malware analysis report

Static analysis result for SHA-256 4beed6746430677f…

MALICIOUS

PDF

77.2 KB Created: 2021-04-18 11:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1ea1510c2b6ef9af60447a90de24f97 SHA-1: 78f9865ddfbf2e6d5899a0c41d0f5be4dbdd6c67 SHA-256: 4beed6746430677fca1c7d40186d0625d5dff00d5e33f76aaf24d60c59825486
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=what+are+the+core+values+of+physical+education PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5fe2260607e8a.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/nerulobodo.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/cjeVF54/real_bike_race_2019_results.pdfIn PDF document text
    • https://jogabaxeke.weebly.com/uploads/1/3/4/7/134704809/8967357.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/3162060.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/gCggXjg/flashlight_won_t_turn_off_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/yDoyghD/the_last_survivors_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/Ei1bhhz/how_to_make_chicken_thighs_and_drumsticks.pdfIn PDF document text
    • https://tebokatesax.weebly.com/uploads/1/3/3/9/133999418/kaxasokap_xisaxasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6011a475e9c12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fffa352cb8ca.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/uhahdkH/84879809043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff16fe8504b3.pdfIn PDF document text
    • http://guwejusu.22web.org/canon_g7x_iii_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/ibghpAI/68355180101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumeriladokovot.epizy.com/kofanafepimowexakuv.pdfIn PDF document text
    • http://daxipazomodej.epizy.com/67596171132.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 5416 bytes
SHA-256: 3dca42a4461fa233b240b859f2ca501a736b4b925323d86f681f571cee21b7eb
font_01_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 10388 bytes
SHA-256: 5d63f52eb12c7eb3a833bfb51bbe5185af2ee4f96d795c2a05336680b3214011

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